WE CLAIM:
1. A method for producing a printed matter by printing ink
on a film, comprising using a film having a nitrogen element
concentration of 0.5 to 10.0 atom% in the film surface and
irradiating with an active energy ray after printing.
2. The method for producing a printed matter of claim 1,
wherein a surface layer of the film is a layer having a nitrogen
compound including at least one of melamine compounds and
urethane compounds.
3. The method for producing a printed matter of claim 2,
wherein the film is a polyester film or a polyamide film.
4. The method for producing a printed matter of claim 1,
wherein the film is made by mixing an amine ester compound in
a film, and has been treated by corona discharge in an air
atmosphere.
5. The method for producing a printed matter of claim 1,
wherein the film has been treated by corona discharge in a mixed
gas atmosphere having amixing ratio of nitrogen to carbon dioxide
(N2/CO2) in a range of 99.5/0.5 to 50/50 in terms of the volume
ratio, and an oxygen concentration of 0.1% by volume or less.
6. The method for producing a printed matter according to
any one of claims 1 to 5, wherein the ink is active energy
ray-curable printing ink including a pigment (a), a resin having
an ethylenic unsaturated group (b) , and a (meth)acrylate (c) .
7 . The method for producing a printed matter according to

claim 6, wherein the resin having an ethylenic unsaturated group (b) has a carboxyl group.
8 . The method for producing a printed matter according to claim 6 or 7, wherein the resin having an ethylenic unsaturated group (b) has a carboxyl group, and its acid value is 30 mgKOH/g or more and 250 mgKOH/g or less.
9. The method for producing a printed matter according to
any one of claims 6 to 8, wherein the (meth) acrylate (c) of the
ink has an alicyclic skeleton or an aliphatic skeleton with a
carbon number of 6 to 18.
10. The method for producing a printed matter according to
any one of claims 6 to 8, wherein the (meth) acrylate (c) of the
ink has both of a rosin skeleton and a hydroxyl group.
11. The method for producing a printed matter according to
any one of claims 1 to 10, wherein the ink further comprises
a photopolymerization initiator (d).
12. The method for producing a printed matter according to
claim 11, wherein the photopolymerization initiator (d) includes
an acylphosphine oxide compound.
13. The method for producing a printed matter according to
any one of claims 1 to 12, wherein the thickness of the film
is 3 0 um or less.
14. The method for producing a printed matter according to
any one of claims 1 to 13, wherein the active energy ray is a
bright line with a wavelength of 350 to 420 nm emitted from a

light emitting diode.
15. The method for producing a printed matter according to
any one of claims 1 to 13, wherein the active energy ray is an
electron beam.
16. The method for producing a printed matter according to
any one of claims 1 to 15, comprising printing the ink on the
film using an offset printing plate.
17 . A printing machine for offset printing which prints ink for offset printing on a film, having a function of treating the film by corona discharge in a mixed gas atmosphere having a mixing ratio of nitrogen to carbon dioxide (N2/CO2) in a range of 99.5/0.5 to 50/50 in terms of the volume ratio, and an oxygen concentration of 0.1% by volume or less, and a function of radiating an active energy.
18. The printing machine for offset printing of claim 17, which has a function of continuously performing the steps of treating the film by corona discharge in a mixed gas atmosphere having a mixing ratio of nitrogen to carbon dioxide (N2/CO2) in a range of 99.5/0.5 to 50/50 in terms of the volume ratio, and an oxygen concentration of 0.1% by volume or less, printing the ink on a film, and radiating an active energy ray on a roll-to-roll system.